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A control strategy to manage the circulating current content in a Modular Multilevel Converter in direct AC-AC topology is proposed in this article. The converter is connected in three-phase YDY configuration which forms a closed delta path for free current circulation while keeping outsider waveforms with low THD content. Circulating current correction becomes necessary face to any kind of unbalance...
Intelligent prosthetics aim to provide a communication channel between disabled people and external world. Among them, walking-assistive device to help people with lower-limb disability attracts attention but still limited by unnatural gait or lack accurate real-time control. Here we studied the coupling between the upper limbs and the lower limbs since the whole body actually involved during walking...
In order to improve the distance, power, and efficiency of power transfer in wireless power transfer system under the weak coupling condition, a 3-coil weak coupling power transmission model was created. A new match adjustment method of the Impedance network is raised based on the usage of impedance transformation of the relay. Adjusting the distance of the coil gives the maximum efficiency on the...
Variable pump driving variable motor (VPDVM) is an essentially nonlinear system with dual-input single-output and coupling. Regular control algorithms are difficult to achieve approving control effects on this kind of system. In this paper, the sliding mode genetic control algorithm is proposed for VPDVM. The algorithm mainly aims at solving problems of nonlinearity and unable-decoupling of VPDVM...
The tension control technology of unit-type gravure printing machine is very important. The constant printing tension is the key factor to ensure the overprinting quality. So the research on modeling theory and control technology of control system becomes an important problem to restrict the technology development of unit-type gravure printing machine. In this paper, the winding tension system of...
Combined heat and power networks effectively improve energy efficiency. It is necessary to get a global solution with high accuracy for the combined networks, which is the basis of the subsequent analysis and optimization. State estimation has been widely adopted in the power system to decrease errors caused by measurements. Similarly, state estimation can also be used in the district heating network...
A coordinated economic dispatch method for multi-area power systems is proposed. The proposed algorithm is based on the partition of the system states into internal and boundary state variables. For fixed boundary states, the local operator computes the critical region containing the point of boundary states and the coefficients of its optimal cost function then communicates them to the coordinator...
Precision centrifuge is an important electromechanical equipment which is used to test and calibrate model parameters of accelerometers. For a 2-DOF(Degree of Freedom) precision centrifuge, which offers a high overload environment and two rotating degree of freedom at the same time, a continuously rotary countershaft is configured reasonably to counteract the rotation motion of the mainshaft system...
The mechanism structure and the mechanical measure method of the calculator are designed, which are the key technology of calculator for the quadratic equation with one unknown. Firstly, the basic principle of a kind of mechanical calculator for quadratic equation with one unknown is proposed. Secondly, the function and performance requirements of the system is analyzed and the linkage mechanism is...
The helical waveguide resonantly couples the TE21 and TE11 modes and results in a ‘TE21-like’ eigenmode, so its dispersion characteristic needs to be researched. The dispersion equation of the traveling wave mode and backward wave mode is derived for engineering applications. The model is built and the helical waveguide is simulated by using three-dimension electromagnetic emulation software HFSS.
The output torque of outer motor and inner motor is affected by each other in Unified Field Dual Mechanical Port Electric Machine (UFDMPM), because of its electromagnetic coupling characteristic. A new control strategy is proposed to control the UFDMPM, by which the inner motor and outer motor can be separately controlled, in spite of existing electromagnetic coupling between them. In the end, the...
This research is about the mechanisms and development of absorptive capacity and technology innovation of enterprises through cooperating with external organizations in the open innovative environment. System dynamics is applied to model this case. The conclusion is that, in the open innovative environment, the process of organizational cooperation and knowledge absorption indeed has a strong influence...
Flatness and gauge are the most important factors in strip quality. Automatic gauge control (AGC) and automatic flatness control (AFC) are a coupled multivariable system, which holds down the quality of strip heavily. In this paper the dynamic mathematics model is established considering AGC and AFC as a whole system, designing intelligent-decoupling method based on CMAC model. The simulation shows...
An analytical model is presented for the double slot coupled cavity slow-wave structure (CCSWS) in this abstract. By matching boundary conditions in conjunction with Green's function techniques and moment method (MOM), the formulae for discussing the high frequency characteristics of the SWS, including dispersion and coupling impedance, are given.
We find the very eigenspaces where multipartite entanglement is more persistent than the bipartite entanglement and can even evolve into a specific constant in a model many-spin systems decohered by a thermal bath.
Considering the existence of the coupling effects that are distributed in the seeker loop, the actuators, the aerodynamic forces and the sensitive devices of the rolling aircraft, it will to some extend affect the control quality and add difficulty to the design of the control system. And in condition of strong coupling, the success or failure of the whole control system may even be affected. This...
In this paper, a new type of decoupled 2-DOF translational parallel micro-positioning stage is designed to realize the 2-DOF ultra-precision linear motion. The stage consists of two piezoelectric actuators (PZTs) and a monolithic compliant mechanism. The monolithic compliant mechanism adopts two types of compound double parallel four-leaf flexures and a mirror symmetric structure to reduce the input...
Nonlinear coupling disturbance is an important factor to the precision of three-axis swing turntable. The paper studied platform model and anti-disturbance compensation control algorithm based on robust control idea. A three-axis turntable mathematical model is proposed using theory of DC motor and coupling torque equation. The robust controller is designed according to the adaptive robust compensation...
The power and temperature control of Laser Diode (LD) involve the coupling impact, which will affect its use. Based on the analysis of thermoelectric cooling (TEC) devices and LD operating characteristics, the data which describes the influence of TEC input current and LD drive current on temperature was collected respectively. Then the transfer function was established by using of MATLAB iteration...
In this study, a nonlinear model is developed to connect a biomimetic autonomous underwater vehicle (BAUV) with human cardiovascular system. The BAUV with sensors and a compliant tail is capable to perform Carangiform locomotion. To make the tail of the BAUV perform rhythmic motion, a nonlinear feedback torque is applied to the tail equation to construct a self-excited oscillator. Besides, a system...
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